It’s interesting that analysis of an engineering system, from a control standpoint, involves discovering where the state is kept. The same word, “state”, which we use in a political context. Where are the gazinatas and gazoutas? Where does potential and kinetic energy store itself internally? Given a transfer function that models something, what signals would be required to drive the system to a different operating point? To put the elevator on another floor of the building in a way that is quick, but does not have the passengers going ballistic. All useful feedback is negative: “Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.”  John 15:2

In fact, that could be a slogan for the blogosphere: “All useful feedback is negative.” In the rare instance that [fill in name of politician] is doing something right … but never mind, we’ll cover that when we get into fiction generally.